3M BP0210500

Neogen® Dehydrated Media is formulated to promote optimal growth, colony formation and cell morphology. Our media is a blend of the highest quality ingredients to ensure the best possible microbiological results. Fraser Broth Base is a selective medium used for the secondary enrichment of Listeria monocytogenes and Listeria spp., as described in ISO 11290-1:2017. Fraser Broth is not intended for use in the diagnosis of disease or other conditions in humans. Fraser Broth Base was developed as a modification of UVM medium and is based on the formula as described by Fraser and Sperber. Listeria spp. hydrolyze esculin to esculetin which reacts with the ferric ammonium citrate resulting in a black precipitate and a visible positive reaction.